emerson



S. T. EMERSON. SWITCH GHAIR.

Patented Apr, 9, 1867.

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S. T. EMERSON, OF AMBOY, ILLINOIS, ASSIGNOR TO HIMSELF AND J. B.

ILDAMS,v OF SAME PLACE.

Letters Patent No. 63,624, dated April 9, 1867.

IMPROVED SWITCH-CHAIR.

TO ALL WHOM IT MAY CONCERN:

Beit known that I, S. T. EMERSON, of Amboy, in the county of Lee, and State of Illinois, have invented a I new and useful improvementin Switch-Choirs and I do hereby declare that the following is efull and exact description thereof, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a. perspective view of the chair.

Figure 2, an end view of the some; and

Figure 3 is atop view or plan Similar letters of reference in the several figures indicating corresponding pnrts.

The object of my invention is to construct a. cast-iron switch-cheir, with or withoutthe rubber seat, of such a form or shape as, first, to give the greatest possible strength with a given amount of cast iron second, to give to the chair permanence in position; and, third, when used in combination with theruhber seat, to deaden the blow of the passing wheels on the ends of the switch-rails, and to render such blow less destructive to the switchrails and to the machineryf To enable others skilled in the art to mnlie and use my invention, I will proceed to describe its.construotio:i and operation.

The top of the chair has a pious surface, with two projections at S S, a. lip, P, and holes for spikes, L L L L while its bottom is not, us is usual in switch-chairs, parallel to the face, but is formed in a triangular shape, as indicated by B C D, the chair being thicker at C than at B or D. The surfaces of the bottom of the chair are slightly concave on the line D H I, as also on the centre line passing through 0. to prevent the chair from rocking. P P represents the rubber seat between the chair and erosstie or head-block. The dotted line AB D E represents the top of cross-tie or hendeblock which is cut down towards C from B and D of such a shape as to correspond with the bottom of the chair and give it an even rest or hearing. The lip P, with projections S S. and spikes driven through the holes L L into the cross-tie, are to secure the permanent or immovable rails in position, as also the spikes driven through the holes L L into the cross-tie, are to secure the chair to its support. The sliding rail moves along the plane N from L to L, as occnsion may require.

This chair is far lighter, and at the same time more substantial, on account of its shape, than the switchchairs now in use on the railroads.

Whnt I claim as my invention, and desire to secure by Letters Patent,

1. The shape of the bottom of the switch-chair, viz, that portion of it that comes in contact with the crosstie or head-block, said shape being a. surface inclined from either end down to ngiven point half way between the ends, and not parallel to the face of the chair, and the planes of the bottom being slightly concave from either side to a point half way between the sides, substantially as herein described and specified.

2. The switch-chair with n bottom as described, in combination with Indie-rubber sent, as herein described.

S. T. EMERSON.

Witnesses:

J. B. TURCHIN, J. P. DOERING. 

